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CVE-2026-25223

7.5 · HIGH

Fastify is a fast and low overhead web framework, for Node.js.

Published Feb 3, 2026CWE-436EPSS 0.88%

Overview

CVE-2026-25223 is a high-severity vulnerability. It was published on February 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type. This issue has been patched in version 5.7.2.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reffastify.dev/docs/latest/Reference/Validation-and-SerializationGitHubgithub.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125GitHubgithub.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272GitHubgithub.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821GitHubgithub.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmqRefhackerone.com/reports/3464114Refaccess.redhat.com/errata/RHSA-2026:10184Refaccess.redhat.com/errata/RHSA-2026:5807Refaccess.redhat.com/errata/RHSA-2026:6192Refaccess.redhat.com/security/cve/CVE-2026-25223

How CyberStrike helps

Frequently asked questions

What is CVE-2026-25223?

CVE-2026-25223 is a high-severity vulnerability. It was published on February 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-25223?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-25223?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-25223?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-25223 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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